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https://www.readbyqxmd.com/read/28550798/sediment-quality-in-a-metal-contaminated-tropical-bay-assessed-with-a-multiple-lines-of-evidence-approach
#1
Sarah K Rodrigues, Denis M S Abessa, Ana Paula de C Rodrigues, Abílio Soares-Gomes, Carolina B Freitas, Ricardo E Santelli, Aline S Freire, Wilson Machado
A sediment quality assessment was performed near to the main industrial source of metal contamination in Sepetiba Bay, Brazil, which represents one of the worst cases of trace metal contamination reported for coastal areas. Acute and chronic toxicity tests, benthic fauna community analysis and metal bioavailability evaluations were applied to identify risks to the benthic community. Significant amphipod mortality was observed close to the major pollution source and lower copepod fertility was observed for all stations...
May 24, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28550737/activated-carbon-from-sugarcane-bagasse-ash-for-melanoidins-recovery
#2
A Kaushik, S Basu, K Singh, V S Batra, M Balakrishnan
This work investigates the value added utilization of two sugar-distillery wastes: (i) melanoidins, which are complex Maillard reaction products in molasses distillery wastewater, and (ii) unburnt carbon in sugarcane bagasse ash. Activated unburnt carbon (AUC), prepared by deashing and steam activation, had properties comparable to commercial activated carbon (CAC). Both carbons are suitable for melanoidins adsorption followed by desorption using 25% pyridine solution. For AUC, the equilibrium adsorption data is well described by Langmuir isotherm up to 35 °C while Freundlich model fits better at higher temperature...
May 24, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28550367/in-vitro-study-of-antioxidant-and-antibacterial-activities-of-lactobacillus-probiotic-spp
#3
Z Pourramezan, R Kasra Kermanshahi, M Oloomi, A Aliahmadi, H Rezadoost
This study investigated the influence of aeration and minimal medium conditions on antioxidant and antibacterial activities of 21 probiotic Lactobacillus strains isolated from dairy products. The probiotic potential of the isolates was evaluated by pH and bile tolerance. Random amplified polymorphic DNA polymerase chain reaction (RAPD-PCR) was used to confirm the phenotypic identification of isolates. Antioxidant producer isolates were screened by resistance to reactive oxygen species (ROS). The antioxidant and antibacterial activities of extracellular materials after 48 h fermentation with antioxidative strains were determined using 2,2-diphenyl-1-picrylhydrazyl (DPPH) and broth microdilution assays, respectively...
May 26, 2017: Folia Microbiologica
https://www.readbyqxmd.com/read/28550345/bacillus-zanthoxyli-sp-nov-a-novel-nematicidal-bacterium-isolated-from-chinese-red-pepper-zanthoxylum-bungeanum-maxim-leaves-in-china
#4
Ma Li, Cao Yong Hong, Wang Xiao Yan, Zheng Shuai Chao, Yang Cheng Gang, Duo Jin Ling, Zhou Xing Kui, Xi Jia Qin, Zhu Ming Liang, Mo Ming He
A novel strain, 1433(T), was isolated from leaves of Chinese red pepper (Huajiao, Zanthoxylum bungeanum Maxim) collected from Gansu province in northwestern China, and was characterised by a polyphasic approach. Cells of strain 1433(T) were observed to be Gram-stain positive, aerobic, asporogenous, rod shaped, motile and to have peritrichous flagella. The strain was observed to grow at a range of temperatures and pH, 4-45 °C (optimum 28-32 °C) and 6.0-10.0 (optimum pH 6.0-7.0), respectively. Growth was found to occur in the presence of 0-7% (w/v) NaCl [optimum 0-3% (w/v)]...
May 26, 2017: Antonie Van Leeuwenhoek
https://www.readbyqxmd.com/read/28550078/race-and-gender-differences-in-undergraduate-research-mentoring-structures-and-research-outcomes
#5
Melissa L Aikens, Melissa M Robertson, Sona Sadselia, Keiana Watkins, Mara Evans, Christopher R Runyon, Lillian T Eby, Erin L Dolan
Participating in undergraduate research with mentorship from faculty may be particularly important for ensuring the persistence of women and minority students in science. Yet many life science undergraduates at research universities are mentored by graduate or postdoctoral researchers (i.e., postgraduates). We surveyed a national sample of undergraduate life science researchers about the mentoring structure of their research experiences and the outcomes they realized from participating in research. We observed two common mentoring structures: an open triad with undergraduate-postgraduate and postgraduate-faculty ties but no undergraduate-faculty tie, and a closed triad with ties among all three members...
2017: CBE Life Sciences Education
https://www.readbyqxmd.com/read/28550057/prevalence-and-genomic-characterization-of-escherichia-coli-o157-h7-in-cow-calf-herds-throughout-california
#6
Jay N Worley, Kristopher A Flores, Xun Yang, Jennifer A Chase, Guojie Cao, Shuai Tang, Jianghong Meng, Edward R Atwill
Escherichia coli serotype O157:H7 (E. coli O157:H7) is a zoonotic food- and waterborne bacterial pathogen that has a high hospitalization rate and can cause life-threatening complications. Increasingly, E. coli O157:H7 infections appear to originate from fresh produce. Ruminants, like cattle, are a prominent reservoir of E. coli O157:H7 in the United States. California is one of the most agriculturally productive regions in the world for fresh produce, beef, and milk. The close proximity of fresh produce and cattle present food safety challenges on a uniquely large scale...
May 26, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28549615/surface-sediment-properties-and-heavy-metal-pollution-assessment-in-the-shallow-sea-wetland-of-the-liaodong-bay-china
#7
Jin Wang, Siyuan Ye, Edward A Laws, Hongming Yuan, Xigui Ding, Guangming Zhao
Liaodong Bay, a semi-enclosed bay located in northeastern China, is impacted by the discharges of five rivers. We analyzed 100 surface sediment samples from the Shallow Sea Wetland of Liaodong Bay for grain size and concentrations of organic carbon (Corg) and heavy metals. The ranges of the heavy metal concentrations were 2.32-17μg/g (As), 0.025-1.03μg/g (Cd), 18.9-131μg/g (Cr), 4.6-36.1μg/g (Cu), 0.012-0.29μg/g (Hg), 13.7-33.9μg/g (Pb), and 17.4-159μg/g (Zn). Pollution assessments revealed that some stations were moderately to highly polluted with As, Cd, and Hg...
May 23, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28549422/expression-of-von-hippel-lindau-tumor-suppressor-protein-pvhl-characteristic-of-tongue-cancer-and-proliferative-lesions-in-tongue-epithelium
#8
Hisashi Hasegawa, Yoshiaki Kusumi, Takeshi Asakawa, Miyoko Maeda, Toshinori Oinuma, Tohru Furusaka, Takeshi Oshima, Mariko Esumi
BACKGROUND: Patients with tongue cancer frequently show loss of heterozygosity (LOH) of the von Hippel-Lindau (VHL) tumor suppressor gene. However, expression of VHL protein (pVHL) in tongue cancer has rarely been investigated and remains largely unknown. We performed immunohistochemical staining of pVHL in tongue tissues and dysplasia, and examined the association with LOH and its clinical significance. METHODS: Immunohistochemical staining of pVHL in formalin-fixed, paraffin-embedded sections of cancerous and other tissues from 19 tongue cancer patients showed positivity for LOH of VHL in four samples, negativity in four samples, and was non-informative in 11 samples...
May 26, 2017: BMC Cancer
https://www.readbyqxmd.com/read/28549353/crowding-visual-awareness-and-their-respective-neural-loci
#9
Kilho Shin, Susana T L Chung, Bosco S Tjan
In peripheral vision, object identification can be impeded when a target object is flanked by other objects. This phenomenon of crowding has been attributed to basic processes associated with image encoding by the visual system, but the neural origin of crowding is not known. Determining whether crowding depends on subjective awareness of the flankers can provide information on the neural origin of crowding. However, recent studies that manipulated flanker awareness have yielded conflicting results. In the current study, we suppressed flanker awareness with two methods: interocular suppression (IOS) and adaptation-induced blindness (AIB)...
May 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28549042/spontaneous-union-of-an-accidentally-fractured-proximal-segment-during-vertical-ramus-osteotomy
#10
Tae Hoon Yu, Hun Jun Lim, Jun Lee, Bong Chul Kim
After sawing in the intraoral vertical ramus osteotomy, in the case of an incomplete amputation, the proximal segment is split using the osteotome. Unfortunately, in this case, the proximal segment was accidentally fractured. The operation was completed without performing any other fixation. Postoperatively intermaxillary fixation was performed and kept for a week, followed by physical therapy, which was initiated immediately after. The patient was closely observed for 6 months. No abnormal findings were detected clinically, and the union of bone was verified...
May 25, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28548823/atmosphere-and-voltage-dependent-electronic-conductivity-of-oxide-ion-conducting-zr1-xyxo2-x-2-ceramics
#11
Marc Jovaní, Héctor Beltrán-Mir, Eloisa Cordoncillo, Anthony R West
Cubic, fluorite-structured solid solutions Zr1-xYxO2-x/2 (YSZ; x = 0.4-0.7) were prepared by sol-gel synthesis. Impedance measurements on pellets of 85% approximate density sintered at 1300 °C for 24 h showed strong evidence of oxide ion conduction with an inclined Warburg spike at low frequencies and capacitance values of ∼10(-6) F cm(-1) at 40 Hz. Arrhenius plots of total pellet conductivities were linear with activation energies of 1.4-1.56 eV. The conductivity decreased with x and was 2-4 orders of magnitude lower than that with optimized YSZ, x = 0...
May 26, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28548659/metatranscriptomic-analysis-of-prokaryotic-communities-active-in-sulfur-and-arsenic-cycling-in-mono-lake-california-usa
#12
Christian F Edwardson, James T Hollibaugh
This study evaluates the transcriptionally active, dissimilatory sulfur- and arsenic-cycling components of the microbial community in alkaline, hypersaline Mono Lake, CA, USA. We sampled five depths spanning the redox gradient (10, 15, 18, 25 and 31 m) during maximum thermal stratification. We used custom databases to identify transcripts of genes encoding complex iron-sulfur molybdoenzyme (CISM) proteins, with a focus on arsenic (arrA, aioA and arxA) and sulfur cycling (dsrA, aprA and soxB), and assigned them to taxonomic bins...
May 26, 2017: ISME Journal
https://www.readbyqxmd.com/read/28548599/an-extent-of-resection-threshold-for-seizure-freedom-in-patients-with-low-grade-gliomas
#13
David S Xu, Al-Wala Awad, Chad Mehalechko, Jeffrey R Wilson, Lynn S Ashby, Stephen W Coons, Nader Sanai
OBJECTIVE Seizures are the most common presenting symptom of newly diagnosed WHO Grade II gliomas (low-grade glioma [LGG]) and significantly impair quality of life. Although gross-total resection of LGG is associated with better seizure control, it remains unclear whether an extent of resection (EOR) "threshold" exists for long-term seizure control. Specifically, what proportion of FLAIR-positive tissue in patients with newly diagnosed LGG must be removed to achieve Engel Class I seizure freedom? To clarify the EOR threshold for long-term seizure control, the authors analyzed data from a consecutive series of patients with newly diagnosed LGG who presented with seizures and subsequently underwent microsurgical resection...
May 26, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28548533/novel-dark-matter-constraints-from-antiprotons-in-light-of-ams-02
#14
Alessandro Cuoco, Michael Krämer, Michael Korsmeier
We evaluate dark matter (DM) limits from cosmic-ray antiproton observations using the recent precise AMS-02 measurements. We properly take into account cosmic-ray propagation uncertainties, fitting DM and propagation parameters at the same time and marginalizing over the latter. We find a significant indication of a DM signal for DM masses near 80 GeV, with a hadronic annihilation cross section close to the thermal value, ⟨σv⟩≈3×10^{-26}  cm^{3} s^{-1}. Intriguingly, this signal is compatible with the DM interpretation of the Galactic center gamma-ray excess...
May 12, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28548099/conformational-dynamics-of-dynamin-like-mxa-revealed-by-single-molecule-fret
#15
Yang Chen, Lei Zhang, Laura Graf, Bing Yu, Yue Liu, Georg Kochs, Yongfang Zhao, Song Gao
Human myxovirus resistance protein 1 (MxA) restricts a wide range of viruses and is closely related to the membrane-remodelling GTPase dynamin. The functions of MxA rely on domain rearrangements coupled with GTP hydrolysis cycles. To gain insight into this process, we studied real-time domain dynamics of MxA by single-molecule fluorescence resonance energy transfer. We find that the GTPase domain-bundle-signalling-element (BSE) region can adopt either an 'open' or a 'closed' conformation in all nucleotide-loading conditions...
May 26, 2017: Nature Communications
https://www.readbyqxmd.com/read/28548097/scalable-focused-ion-beam-creation-of-nearly-lifetime-limited-single-quantum-emitters-in-diamond-nanostructures
#16
Tim Schröder, Matthew E Trusheim, Michael Walsh, Luozhou Li, Jiabao Zheng, Marco Schukraft, Alp Sipahigil, Ruffin E Evans, Denis D Sukachev, Christian T Nguyen, Jose L Pacheco, Ryan M Camacho, Edward S Bielejec, Mikhail D Lukin, Dirk Englund
The controlled creation of defect centre-nanocavity systems is one of the outstanding challenges for efficiently interfacing spin quantum memories with photons for photon-based entanglement operations in a quantum network. Here we demonstrate direct, maskless creation of atom-like single silicon vacancy (SiV) centres in diamond nanostructures via focused ion beam implantation with ∼32 nm lateral precision and <50 nm positioning accuracy relative to a nanocavity. We determine the Si+ ion to SiV centre conversion yield to be ∼2...
May 26, 2017: Nature Communications
https://www.readbyqxmd.com/read/28546891/scaling-law-to-determine-peak-forces-in-tapping-mode-afm-experiments-on-finite-elastic-soft-matter-systems
#17
Horacio V Guzman
Analytical equations to estimate the peak force will facilitate the interpretation and the planning of amplitude-modulation force microscopy (tapping mode) experiments. A closed-form analytical equation to estimate the tip-sample peak forces while imaging soft materials in liquid environment and within an elastic deformation regime has been deduced. We have combined a multivariate regression method with input from the virial-dissipation equations and Tatara's bidimensional deformation contact mechanics model...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28546662/pregnancy-outcome-in-patients-with-solitary-kidney
#18
Vineet V Mishra, Kavita M Mistry, Sakshi S Nanda, Sumesh Choudhary, Rohina Aggarwal, Khushali Gandhi
BACKGROUND: Solitary kidney may be congenital or as a result of nephrectomy. There is a lot of literature available on quality of life in these patients, but there is limited data on pregnancy outcome. OBJECTIVES: To study pregnancy outcome in patients with solitary kidney either congenital or due to nephrectomy. MATERIALS AND METHODS: Study Design This is a retrospective observational study conducted at tertiary health center in Ahmedabad, from 2011 to 2014...
June 2017: Journal of Obstetrics and Gynaecology of India
https://www.readbyqxmd.com/read/28546546/elevated-baseline-potassium-level-within-reference-range-is-associated-with-worse-clinical-outcomes-in-hospitalised-patients
#19
Sehoon Park, Seon Ha Baek, Sung Woo Lee, Anna Lee, Ho Jun Chin, Ki Young Na, Yon Su Kim, Dong-Wan Chae, Jin Suk Han, Sejoong Kim
The clinical significance of elevated baseline serum potassium (K(+)) levels in hospitalised patients is rarely described. Hence, we performed a retrospective study assessing the significance of elevated K(+) levels in a one-year admission cohort. Adult patients without hypokalaemia or end-stage renal disease were included. Adverse outcomes were all-cause mortality, hospital-acquired acute kidney injury, and events of arrhythmia. In total, 17,777 patients were included in the study cohort, and a significant difference (P < 0...
May 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28546544/reproducing-infra-slow-oscillations-with-dopaminergic-modulation
#20
Toshihiro Kobayashi, Yutaka Shimada, Kantaro Fujiwara, Tohru Ikeguchi
In the human brain, billions of neurons construct a neural network via synaptic connections. Neuronal excitation and inhibition are transmitted to other neurons through synapses via neurotransmitters. Dopamine is one of these neurotransmitters that plays a number of important roles. There are a variety of rhythms in the brain, such as alpha rhythm, beta rhythm, and so on. Infra-slow oscillation, ISO, is one of the rhythms observed in the brain, and ranges below 0.1 Hz. One of the key roles of dopamine is the generation of ISO in neural networks...
May 25, 2017: Scientific Reports
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